I have been on a few boats that are over powered by 5 horse and honestly it's not a big deal, even at 15 feet. There were also other upgrades such as a hydro fin and an expensive prop that was helping produce more power. The boat was fast and did 65 on lake Michigan and could handle any weather but you could spin that boat in a dime and you would also submarine through waves when we were being stupid but it was honestly worth the investment to over power the boat